Ion Flotation Spectrophotometric Determination of Trace Amount of Cadmium Ion in Water——Application of Computer Simplex Optimization

This paper describes ion flotation spectrophotometric determination of trace amount of cadmium ion in water modified simplex method (MSM) of multifactor optimization control by means of IBM-PC computer. The optimum condition of determination of cadmium ion can be obtained. An ion flotation spectrophotometric method for determination cadmium ion in water has linearity range 0.00~0.05mg/L, recovery 95%~106%, relative standardd deviation less than 5% and detection limit 0.35μg/L. The optimum experiment conditions for ion flotation as follow: 0.02% 5-Br-PADAP 11.30mL, 1% SDS 5.60mL, ammoniacal buffer solution 22.5mL, non-aqueous alcohol 1.00mL, nitrogen flow rate 0.035 Lmin, respectively. This method has a good feasibility, reproducibility, precision, accuracy and satisfactory recovery ratio.